A ball is thrown at an original speed of 8.0 m/s at an angle of 35° above the horizontal. If there is no air, what is the speed of the ball when it returns to the same horizontal level?
A) 4.0 m/s
B) 8.0 m/s
C) 16 m/s
D) 9.8 m/s
B
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The observed slowing of a clock in the vicinity of a black hole is a prediction of:
A) the Roche Limit. B) Special relativity. C) General relativity. D) Stellar nucleosynthesis. E) the Cosmological Principle.
A 300-g glass thermometer initially at 25°C is put into 200 cm3 of hot water at 95°C. Find the final temperature (in °C) of the thermometer, assuming no heat flows to the surroundings. (The specific heat of glass is 0.2 cal/g/°C.)
a. 52 b. 68 c. 89 d. 79 e. 36
In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section with dimensions 8.00 cm × 8.00 cm
After 5.00 min of running the experiment, 64.0 g of ice have melted. What is the thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg, the latent heat of vaporization of water is 2.256 × 106 J/kg, and both the ice and water are under 1.00 atm of pressure. A) 0.130 W/m ? K B) 0.250 W/m ? K C) 0.440 W/m ? K D) 0.620 W/m ? K E) 1.12 W/m ? K
An AM radio tuning circuit has a coil with an inductance of 4.00 mH and a capacitor set at 7.50 × 10^-6 mF. What frequency will it detect?
a. 1520 kHz c. 550 kHz b. 919 kHz d. 750 kHz